Travel mug



FIG. 1 is a top perspective view of the travel mug;

FIG. 2 is a front view thereof, the left and right sides views being identical; and,

FIG. 3 is a rear view of thereof.

The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for a travel mug, as shown and described. 